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Introduction to Rocks
7th grade science
What are rocks? Rocks are a combination
of minerals
Are all rocks the same? No Not only are they different
colors, but there are also different types
The three main types are igneous, sedimentary, and metamorphic rocks.
Igneous: Granite
Sedimentary: Sandstone
Metamorphic: Gneiss
Where do rocks come from? Rocks are created,
transformed, and destroyed in a process called the rock cycle
Interactive Rock Cycle Animation
http://www.cotf.edu/ete/modules/msese/earthsysflr/rock.html
The rock cycle: Part 1 First of all there is no real
beginning or end to the rock cycle.
However, for this lesson we will begin with igneous rocks.
Igneous rocks often forms when lava erupts from volcanoes then cools.
Igneous Rocks
Can be: Shiny Crystalline Porous
http://geology.about.com/library/bl/images/blrockindex.htm
The rock cycle: Part 2 Secondly, the rock cycle is
not a perfect circle, it does not occur in a specific sequence.
Igneous rocks can be re-melted, eroded, or pressed.
Rocks that are formed from eroded sediment are Sedimentary Rocks.
Sedimentary Rocks
Can be: Grainy, Sandy Made of different pieces
of rocks or minerals Striped
The rock cycle: Part 3 Finally, rocks can be
transformed over time to make new rocks.
Heat and pressure can create new rocks
These rocks are called Metamorphic rocks.
http://www.tulane.edu/~sanelson/geol111/metamorphic.htm
Metamorphic Rocks
Come in a variety of styles, shapes and colors
Many have stripes, but not all
Many contain unique crystal and mineral formations only unique to metamorphic rocks
Review
There are review questions about rocks on the following slides.
In order to progress through the quiz in the correct order you have to click the links on the slides.
Click the “Begin Quiz” link on this page to start the quiz.
Begin Quiz
1. True or False: The rock cycle always starts with igneous rocks and
ends with metamorphic rocks.
A. True
B. False
2. True or False: The rock cycle does not always follow the same order.
A. True
B. False
3. Igneous rocks…
A. Can be formed from pieces of sediment that have been compacted and glued together.
B. Can be formed from molten magma or lava.
C. Are formed when heat and pressure transform old rocks into new rocks.
4. Sedimentary rocks…
A. Can be formed from pieces of sediment that have been compacted and glued together.
B. Can be formed from molten magma or lava.
C. Are formed when heat and pressure transform old rocks into new rocks.
5. Metamorphic Rocks
A. Can be formed from pieces of sediment that have been compacted and glued together.
B. Can be formed from molten magma or lava.
C. Are formed when heat and pressure transform old rocks into new rocks.
References http://www.cotf.edu/ete/modules/msese/earthsysflr/rock.html
http://geology.about.com/library/bl/images/blrockindex.htm http://www.tulane.edu/~sanelson/geol111/metamorphic.htm
